Improvement in upright pianos



E. GABLER.

UPRIGHT PIANO.

No,169,984 (I Patented Nov. 16 1875.

O Q A 0 O Q Q Q E: C l 1;

' ANN! Mimi! d mum UNITED STATES PATENT Drrroe ERNST GABLER, OF NEW YORK, N. Y.

IMPROVEMENT IN UPRIGHT PIANOS.

Specificationforming part of Letters Patent No. 169,984, dated November 16, 1875; application filed September 11, 1875.

To all whom it may concern Be it known that I, ERNST GABLER, of the city, county, and State of New York, have invented a new and Improved Agraft'e-Bar for Upright Pianos, of which. the following is a specification In the accompanying drawing, Figure 1 represents a front elevation, and Fig. 2 a vertical transverse section on the line 0 c, of my improved agraft'e-bar for upright pianos.

ure of strings thereon.

In the drawing, A represents the wrestplank, B the metallic string-plate, and O the agratt'e-bar, of an upright piano. The agraffe-- bar 0 is interposed between wrest-plank A and plate B, being made of bell-metal or other suitable material, and of sufficient height above the plate to allow the stretching of the strings. The shape of the metallic agraft'e-bar O corresponds exactly to that of plate B, so that the same bears equally throughoutits entire length thereon, and locks the bar by the joint pressure of the strings rigidly against the wrest-plank. The perfectly rigid and fixed position of the agrat't'e-bar prevents the vibration and sounding of the steel wire bridge hitherto in use on the action of the hammer, and destroys thereby the sound caused by the same.

The tone of the strings is rendered fuller by the rigidity of the agrafl'e-bar, and the sounding of the. wrestplank in consequence of the vibration of the strings neutralized by the strong compound pressure exerted by the strings on the string-plate and bar, and by the same on the Wrestplank. The fixed position of the agratte-bar and the powerful pressure exerted on the wrest-plank produce the isolation of the wrest-plank from the plate and a superior tone of the piano.

Having thus described myinvention, Iclaim as new and desire to secure by Letters Patent In upright pianos, the combination, with the wrest-plank and the string-plate, of an illterposed isolating agraft'e-bar, secured rigidly against the wrest-plank by the compound pressure of the strings on the plate, substantially in the manner and for the purpose specified.

ERNST GABLERQ Witnesses:

PAUL GOEPEL, JAMES H. HUNTER. 

